共查询到20条相似文献,搜索用时 93 毫秒
1.
3-芳氧基-6-取代哒嗪的合成及其除草活性 总被引:4,自引:0,他引:4
合成了系列3-芳氧基-6-取代哒嗪类化合物.化合物结构经1HNMR、元素分析、IR和MS确证.生物活性测试结果表明,该类化合物具有很好的除草活性,讨论了其结构与除草活性的关系. 相似文献
2.
3.
4.
5.
3-烷氧基-6-取代苯氧基哒嗪的合成及其除草活性的构效关系 总被引:7,自引:0,他引:7
用3,6-二取代苯氧基哒嗪与醇钠进行亲核取代反应的新方法合成19个3-烷基-6-取代苯氧基哒嗪.对目标化合物进行了pI50和盆栽除草活性的测试,部分化合物的活性高于对照药品马来酰肼.初步定量构效关系的结果表明:苯环3,4位上带有吸电子取代基以及增加分子的脂溶性对提高除草活性有利 相似文献
6.
以4,6-二烷氧基-2-三嗪基异氰酸酯和N,N-二取代脲为原料,合成了10个未见文献报道的标题化合物,其结构经1HNMR,IR和元素分析确证。初步生物活性测定表明,所有化合物均具有一定的除草活性。其中部分化合物具有明显的除草活性。 相似文献
7.
吡唑衍生物的合成及生物活性 总被引:15,自引:2,他引:15
以5-吡唑甲酰肼(7,8)为原料合成了4类共30种新化合物,这些化合物的结构均经^1H NMR,元素分析证实,部分化合物还经过了MS、IR确证,对大部分化合物做了生物活性测试,结果表明均具有一定的杀菌和除草活性。 相似文献
8.
设计合成了一系列文献中未报道的2-取代-6-甲基-4-苯基-3(2H)-哒嗪酮类化合物,其结构经过1H NMR和元素分析确证,化合物4e进行了X射线衍射晶体结构分析.利用油菜平皿法和稗草小杯法对化合物进行了生物活性的测定.初步生物活性测试结果表明,化合物4具有较好的除草活性.定量构效关系表明,化合物4结构中哒嗪环2-位取代基的变化,影响了化合物的抑制活性.当作用对象为油菜时,化合物的活性可能主要与取代基R的立体参数B4和疏水性有关;当作用对象为稗草时,化合物的活性可能主要与取代基R的疏水性有关.部分化合物4的抑制活性与对照药品5b,5k基本相当,但没有表现出5b,5k所具有的白化效果.化合物4与5这两类结构类似的化合物很可能在生物体内拥有不同的作用机制. 相似文献
9.
苯环2-位不同酯基取代的磺酰脲类化合物的合成及其除草活性 总被引:5,自引:2,他引:3
以正在开发的磺酰脲类超高效除草剂NK94827[N'-(4'-甲基嘧啶-2'-基)-2-甲氧羰基苯磺酰脲]的基本结构为基础,设计合成了18个苯环2位不同酯基取代的的新型磺酰脲类化合物,产物结构均经1HNMR及元素分析确证.经油菜平皿法和盆栽试验测试除草活性,所合成的部分磺酰脲化合物的除草活性高. 相似文献
10.
2-氟-6-氟苯甲酰基嘧啶基硫脲的合成及生物活性研究 总被引:9,自引:0,他引:9
合成了7个未见文献报道的2-氟-6-氯苯甲酰基硫脲,其结构经元素分析、~1H NMR和IR确证。初步活性测试结果表明:部分化合物具有较好的除草活性。 相似文献
11.
硝基咪唑化合物结构与性质的理论研究 总被引:9,自引:0,他引:9
采用密度泛函理论B3LYP方法在6-311G(d,p)水平上, 对10种硝基咪唑化合物进行了理论计算: 几何优化结果显示所有化合物均无虚频, 为势能面上的稳定结构. 基于自然键轨道理论和三维静电势图, 分析了稳定结构的成键情况、咪唑环上的共轭性及硝基咪唑化合物的反应性. 理论估算了10种化合物的标准气态生成热和密度, 最后采用VLW方程计算了这些化合物的爆速、爆压, 其爆速在8.7和9.5 km/s之间. 结果表明: 咪唑环上有一定的芳香性, 所设计的系列硝基咪唑化合物能量高, 其中三硝基咪唑化合物是最有潜力的含能材料候选物. 相似文献
12.
I M Goldman J Seibl I Flament F Gautschi M Winter B Willhalm M Stoll 《Helvetica chimica acta》1967,50(2):694-705
Pyrazines and pyridines occurring in a coffee concentrate are analyzed by two procedures. 24 compounds have been identified and the presence of some 10 more is revealed. The syntheses, mass and infrared spectral data of reference compounds are given. 相似文献
13.
R. M. Taylor 《无机化学与普通化学杂志》1972,390(1):85-96
Compounds which have been identified as metal cyanurates have been prepared by heating certain metal oxides or salts directly with urea. Copper, nickel, cobalt, zinc, iron and manganese compounds have been formed in this manner. X-ray diffraction data and possible structures for some of these compounds are presented. 相似文献
14.
R. S. Pemberton M. C. Depew S. D. Pollington J. K. S. Wan 《Research on Chemical Intermediates》1995,21(3-5):425-439
The reactions of alkyl peroxyl radicals with cellulosic and lignin-containing papers have significance in both the problems of brightness reversion and paper aging phenomena. Since transient peroxyl radicals are elusive to ESR and other spectroscopic detection, we have explored the controlled study of the interactions of nitrogen oxides with paper and some model lignin compounds in solution as a comparable model of free radical oxidation. Formations of intermediate iminoxyl and nitroxide radicals are identified by ESR with products in some model systems analysed by GC/MS to elucidate the primary mechanisms of the interactions of these gaseous free radicals with papers and with some simple organic model lignin compounds. 相似文献
15.
Ring contraction reactions of heterocyclic compounds under mass ionization conditions are important and interesting phenomenon.[1] It should be very useful to elucidate the fragmentation of some novel heterocyclic compounds and to identify the structures of some effective compounds in a screened library by mass spectrometric method, which is an easy and available method for identification of effective members in a library due to development of LC-MS. Recently several ring contraction reactions have been reported in literatures. 相似文献
16.
All carbon resonances in the title compounds have been unequivocably assigned. Steric effects in the peri substituted compounds have been compared with analogous effects in naphthalene and benzo[b]furan. The observed effects are not explained by current theory. Unusual deshielding steric shifts are observed at some carbons. Methyl substituent effects are not additive at any position in the sterically crowded 2,3-disubstituted compounds. 相似文献
17.
18.
Testosterone derivatives and related compounds (such as anabolic-androgenic steroids—AAS) are frequently misused by athletes (both professional and amateur) wishing to promote muscle development and strength or to cover AAS misuse. Even though these agents are vastly regarded as abusive material, they have important pharmacological activities that cannot be easily replaced by other drugs and have therapeutic potential in a range of conditions (e.g., wasting syndromes, severe burns, muscle and bone injuries, anemia, hereditary angioedema). Testosterone and related steroids have been in some countries treated as controlled substances, which may affect the availability of these agents for patients who need them for therapeutic reasons in a given country. Although these agents are currently regarded as rather older generation drugs and their use may lead to serious side-effects, they still have medicinal value as androgenic, anabolic, and even anti-androgenic agents. This review summarizes and revisits the medicinal use of compounds based on the structure and biological activity of testosterone, with examples of specific compounds. Additionally, some of the newer androgenic-anabolic compounds are discussed such as selective androgen receptor modulators, the efficacy/adverse-effect profiles of which have not been sufficiently established and which may pose a greater risk than conventional androgenic-anabolic agents. 相似文献
19.
20.
The quantum yields of triplet formation by some α,ω-dinaphthylalkanes and related compounds which exhibit intramolecular excimer fluorescence and/or intramolecular fluorescence quenching have been determined. Although most compounds have quite high quantum yields (~ 0.4) others are much lower and no single reason could be found to explain this variance. 相似文献